Digital Commons Network^™

Dune Building Dynamics Impact Cross-Island Connectivity And Barrier Island Characteristics, Alexander Sabo

Theses and Dissertations

Located at the land-sea interface, barrier islands are important protective features that reduce wave energy and erosion from mainland areas. Further, barrier islands provide habitat for many different organisms and serve as popular areas for recreation and tourism. As sandy landforms, barrier islands are easily disturbed, but often recover after disturbance as a result of island plant communities, specifically dune building grasses. Disturbance on barrier islands is driven by storms, tides, and overwash events. After disturbance has occurred, dune grasses colonize the dunes allowing for dune building and habitat restoration. On the Virginia barrier islands, there are three dominant dune …

A Methodology Of Paradoxes: Investigating Authenticity In The Representation Of Queerness On The Contemporary Stage, Kendall C. Walker

Theses and Dissertations

In my experience as a queer theatre practitioner, performer, and student, I have always had questions of ownership and authenticity when it comes to LGBTQIA+ narratives on the contemporary theatre stage. The question of: “Who is allowed to tell what story?” and the many complex ideas that this leads to, is what has inspired this thesis and my own pedagogy of intersectionality and inclusivity.

The purpose of this thesis is to investigate the relationship between authenticity and queerness on the contemporary stage in order to develop a methodology for how all theatre practitioners—no matter their identity—can effectively tell queer-identifying stories …

Acculturative Stress And Quality Of Life Among Older Korean Immigrants: Do Religiosity And Resilience Matter?, Sunghwan Cho

Theses and Dissertations

The impact of acculturative stress on the quality of life among older adults has been widely acknowledged in previous literature. However, few studies have explored the role of religiosity and resilience in this relationship among older Korean immigrants. This dissertation explores the relationships between acculturative stress, religiosity, resilience, and quality of life among 300 older adults aged 65 years and over who live in an ethnic Korean enclave of Queens, New York. The study employs path analysis and multiple regression analyses to test hypothesized relationships among these variables.

The key findings of the study are as follows: (1) higher acculturative …

Wifi Sensing At The Edge Towards Scalable On-Device Wireless Sensing Systems, Steven M. Hernandez

Theses and Dissertations

WiFi sensing offers a powerful method for tracking physical activities using the radio-frequency signals already found throughout our homes and offices. This novel sensing modality offers continuous and non-intrusive activity tracking since sensing can be performed (i) without requiring wearable sensors, (ii) outside the line-of-sight, and even (iii) through the wall. Furthermore, WiFi has become a ubiquitous technology in our computers, our smartphones, and even in low-cost Internet of Things devices. In this work, we consider how the ubiquity of these low-cost WiFi devices offer an unparalleled opportunity for improving the scalability of wireless sensing systems. Thus far, WiFi sensing …

The Type Iv Pilus Secretin Bfpb: Structural Analysis And Binding Interactions, Janay I. Little

Theses and Dissertations

Enteropathogenic Escherichia coli (EPEC) causes severe diarrhea in young children. The type IV pilus (T4P) of EPEC, known as the bundle-forming pilus (BFP), plays an important role in EPEC pathogenesis. T4Ps are a family of surface appendages that are important for adhesion, colonization, biofilm formation, virulence, twitching motility and many other functions. One essential component of the BFP system is the secretin, BfpB. Secretins are a large family of integral outer membrane proteins found in T4Ps as well as type II and type III secretion systems, and filamentous phages. Details of the secretin structure have been limited to the overall …

Romantic Nostalgia: Examining The Motivational And Relational Outcomes, Margaret Kneuer

Theses and Dissertations

Romantic nostalgia, or the sentimental longing and wistful affection towards a romantic partner (Evans et al., in press), is a type of nostalgia pertaining to relationships that has not been addressed widely in the current literature. The goal of this research is to investigate whether romantic nostalgia buffers against conflict and promotes motivational benefits to the relationship. I extend the work on the restorative nature of nostalgia to close relationships and explore cognitive, motivational, and behavioral relationship maintenance strategies. Study 1 sampled university students currently in romantic relationships to examine the association between romantic nostalgia proneness and compassionate goals. Romantic …

Aerosol Synthesis Of Tungsten Bronze Particles For Nir Shielding, Hao Tu

Theses and Dissertations

This dissertation emphasizes the need for efficient energy use in buildings and transportation due to global warming and the energy crisis. It suggests that improving energy efficiency can help reduce energy consumption and emissions and support sustainability. The dissertation introduces various transparent materials that can block near-infrared (NIR) radiation from solar radiation to save energy and money, and it highlights the growing market value of such products. The dissertation compares tungsten bronze with other NIR shielding materials and shows its advantages. The dissertation introduces a cheap and environmentally friendly method for continuously producing tungsten bronze particles via aerosol synthesis. Particle …

Natural Hazard Uncertainty Characterization And Risk Assessment For Pressurized Water Reactor Safety Based On System Level Reactor Safety Analysis Models, Tao Liu

Theses and Dissertations

Natural hazard accidents, especially the Fukushima Daiichi accident that occurred in 2011, have brought up significant safety concerns regarding the nuclear power plant (NPP) under external natural hazards. As a result, external natural hazards have been identified as one of the potentially most significant risk contributors to the core damage frequency of the NPPs, highlighting the need for a better understanding of the natural hazards and their associated uncertainties for probability risk assessments (PRAs). However, there are limited computational models and analysis tools to support the probabilistic evaluation of external hazards in PRAs, especially for natural hazards such as floods …

I. Preparation Of Strategic Synthetic Building Blocks For World Health Organization Essential Medicines. Ii. Applying The Principles Of Process Intensification To The Synthesis Of Fluoroquinolone Antibiotics., Jeffrey M. Noble

Theses and Dissertations

The synthesis of active pharmaceutical ingredients is often a time-consuming and expensive process. Due to the nature of pharmaceutical manufacturing, these costs are carried forward to the final purchase price by the consumer. Although there are many factors which are involved in the final costing of a pharmaceutical, the cost associated with the synthesis is the primary one which can be managed by chemists and engineers.

This work discusses the synthetic routes of four active pharmaceutical ingredients as well as the synthetic techniques and equipment used with an emphasis on how the application of specific techniques can be applied to …

Material Extrusion-Based Additive Manufacturing: G-Code And Firmware Attacks And Defense Frameworks, Haris Rais

Theses and Dissertations

Additive Manufacturing (AM) refers to a group of manufacturing processes that create physical objects by sequentially depositing thin layers. AM enables highly customized production with minimal material wastage, rapid and inexpensive prototyping, and the production of complex assemblies as single parts in smaller production facilities. These features make AM an essential component of Industry 4.0 or Smart Manufacturing. It is now used to print functional components for aircraft, rocket engines, automobiles, medical implants, and more. However, the increased popularity of AM also raises concerns about cybersecurity. Researchers have demonstrated strength degradation attacks on printed objects by injecting cavities in the …

Variability In Causal Effects On A Binary Outcome And Noncompliance In A Multisite Randomized Trial, Xinxin Sun

Theses and Dissertations

Noncompliance to treatment assignment is widespread in randomized trials and presents challenges in causal inference. In the presence of noncompliance, the most commonly estimated effect of treatment assignment, also known as intent-to-treat (ITT) effect, is biased. Of interest in this setting is the complier average causal effect (CACE), the ITT effect among compliers. Further complication arises when the outcome variable is partially observed.

My research focuses on estimating the distribution of a site-specific CACE in a multisite randomized controlled trial (MRCT) by maximum likelihood (ML). Assuming compliance missing at random (MAR). We express the likelihood as an integral with respect …

Exploring The Role Of Institutional Culture In Student Affairs Assessment Practitioners’ Experiences Implementing Equity-Centered Assessment, Jaime L. Williams

Theses and Dissertations

Student affairs assessment is a field in higher education that emphasizes the measurement of effectiveness and student learning in student serving programs that take place outside of the classroom. Outcomes-based assessment is the basis of most assessment practices in student affairs, and focuses on the continuous improvement of out-of-classroom programs, services, and student learning. Many assessment practices stem from traditional research methods, which have been developed by people who hold mostly majority identities. These methods were not created with the rapidly changing demographics of today’s college-going students in mind. To help address the increasing diversity of college students and the …

Quantifying Insect Emergence In Tidal Freshwaters And The Importance Of Aquatic Prey In Wetland-Dependent Songbird Diet, Samantha L. Rogers

Theses and Dissertations

Insectivorous birds and their arthropod prey are experiencing widespread population declines, driven largely by anthropogenic disturbance and climate change. For wetland-dependent insectivores that consume a mixture of terrestrial and aquatic insects, understanding the availability, consumption, and nutritional qualities of aquatic diet subsidies is important for conservation. I use prothonotary warblers (Protonotaria citrea) as a model species throughout this work, because their breeding season aligns with aquatic insect emergence and they include aquatic insects when provisioning nestlings. In the first chapter, I estimate aquatic insect emergence from tidal freshwaters, which are understudied compared to nontidal systems. Using continuous field …

Modulation Of Opioid-Induced Respiratory Depression By Stimulants And Their Associated Monoaminergic Receptor Mechanisms In Mice Using Whole Body Plethysmography, Harrison J. Elder

Theses and Dissertations

Opioid overdose and associated deaths involving opioid-induced respiratory depression (OIRD) began to accelerate beginning in 2015 with the emergence of illicitly manufactured fentanyl and its analogs and currently represents one of the most significant public health challenges in the United States. The increases in overdose deaths have occurred despite the increased availability of the opioid overdose reversal agent, naloxone, to first responders and the public. This new phase of the opioid epidemic has been paralleled by substantial growth in the co-use of opioids with stimulants, particularly methamphetamine. The objective of this dissertation is to ascertain whether fentanyl is particularly resistant …

Investigating The Dynamics And Fragmentation Of Nitroaromatic Radical Cations Through Femtosecond Time-Resolved Mass Spectrometry And Computational Chemistry, Hugo Andres Lopez Pena

Theses and Dissertations

Chemists have sought to control molecular dissociation with lasers for decades. Effective control of unimolecular dissociation was only achieved with the development of high-intensity ultrashort pulsed lasers and coherent control techniques that operate on timescales faster than vibrational energy redistribution. In view of this, our lab has specialized in the study of polyatomic radical cations using femtosecond time-resolved mass spectrometry (FTRMS). The interest in radical cations stems from the fact that they are highly reactive species that contribute to many physical, chemical, and biological processes. For instance, radical cations participate in shock initiation of detonated energetic materials used as explosives …

Asymmetric Cuh-Catalyzed Reductive Coupling Of Allenamides With Carbonyl Electrophiles & Development Of Nanocatalysts For Heterogeneously Catalyzed Buchwald-Hartwig Amination, Raphael K. Klake

Theses and Dissertations

Many drugs and natural products contain multiple stereogenic carbons bearing heteroatoms throughout their carbon framework. Therefore, methods that can efficiently install multiple heteroatoms on a molecule are valuable. Reductive coupling reactions have been extensively studied, and the allylation of carbonyls via the reductive coupling approach has been a key method for generating chiral tertiary and secondary allylic alcohols. This work utilizes inexpensive Cu for the asymmetric reductive coupling of allenamides with carbonyls to simultaneously install two heteroatoms (oxygen and nitrogen) on the product. These molecules have a polarity profile that make them difficult to make using traditional methods. Herein, we …

Blockchain Security And Applications, Phuc D. Thai

Theses and Dissertations

Cryptocurrencies, such as Bitcoin and Ethereum, have proven to be highly successful. In a cryptocurrency system, transactions and ownership data are stored digitally in a ledger that uses blockchain technology. This technology has the potential to revolutionize the future of financial transactions and decentralized applications. Blockchains have a layered architecture that enables their unique method of authenticating transactions. In this research, we examine three layers, each with its own distinct functionality: the network layer, consensus layer, and application layer. The network layer is responsible for exchanging data via a peer-to-peer (P2P) network. In this work, we present a practical yet …

A Six-Month Comparison Of Orthodontic Pain Associated With Fixed Edgewise Appliances And Clear Aligners, Victor Chan

Theses and Dissertations

Title: A Six-Month Comparison of Orthodontic Pain Associated with Clear Aligners and Fixed Edgewise Appliances

Objective: To document and compare pain perception, intensity, and analgesic use over a sixmonth period between patients treated with fixed appliances (FA) and clear aligners (CA).

Methods: A prospective, parallel, two-arm, multi-center, longitudinal cohort study was conducted with 87 adults treated with CA (n=59) or FA (n=28). Subjects were selected according to inclusion and exclusion criteria. A seven-item, digital survey was sent at three timepoints (preappointment, 2-days post-appointment, and 7-days post-appointment) at each adjustment over a six-month period. The variables measured included pain experience, pain …

Biting Range, Effie Bowen

Theses and Dissertations

Biting Range is an essayic text about dogs, process, order, and memory. Structured as a conceptual material list, the writing addresses experiential textures and tensions gleaned from observation. Writing within and against the margins, I address the performativity of the page as its own form to be agitated.

Homeworld, Ilana Dodelson

Theses and Dissertations

This thesis explores the experience of being tied to many worlds at once, and how that can be represented through paint.

Thrive: Empowering Women's Health Through Healing Design, Tawny Chamberlain

Theses and Dissertations

MOTIVATION Despite the immense focus on patient-centered care over the past two decades, a lack of knowledge exists regarding how to apply these guidelines to women, which contributes to gender disparities in healthcare (Filler et al, 2020). For example, one in eight American women will have breast cancer in her lifetime, yet one third do not complete regular screenings (NCI, 2020), perhaps because mammograms and gynecological exams often cause significant anxiety and fear in women. Decreased engagement with providers, coupled with disjointed healthcare, leaves women in a vulnerable position. ISSUE There is ample evidence that well-designed spaces can help patients …

A Constructed Memoir: The History And Heritage Of The Baloch Community In Qatar, Somaia Nahang Dorzadeh

Theses and Dissertations

In the 1960s, when my father was only thirteen years old, he took a perilous journey on a boat alone from Sistan va Baluchestan, Iran, to Qatar, in the hopes of a better life. Like many long-term residents from Balochistan, my father has lived in Qatar for decades, predating the establishment of the modern state of Qatar itself in 1971. His legal position in the country today remains subject to the Kafala system, and his residency is subject to his employment status, which must be renewed each year. In other words, permanency is never guaranteed, nor is future planning.

In …

Incorporating Noh Training Into Contemporary Western Theatre: An Examination Of The Benefits To Implementing Noh Theatre And Suzuki Training Into Western Performance Pedagogy, Baylee A. Holloran

Theses and Dissertations

Noh theatre is a traditional Japanese theatre practice that focuses on isolated and intentional physicality and separating actor personality from character. It is an imaginative and heightened performance that differs greatly from Western theatrical realism. This thesis examines Noh theatre, its origins, and why it should be more implemented into Western acting pedagogy. I start by describing what Noh is as an art form, from the ritualistic aspects to how it is staged and performed. Then I outline the religious and historical significance of Noh and how they are showcased in its storytelling and performance. I analyze the pedagogies of …

Innovations In Drop Shape Analysis Using Deep Learning And Solving The Young-Laplace Equation For An Axisymmetric Pendant Drop, Andres P. Hyer

Theses and Dissertations

Axisymmetric Drop Shape Analysis (ADSA) is a technique commonly used to determine surface or interfacial tension. Applications of traditional ASDA methods to process analytical technologies are limited by computational speed and image quality. Here, we address these limitations using a novel machine learning approach to analysis. With a convolutional neural network (CNN), we were able to achieve an experimental fit precision of (+/-) 0.122 mN/m in predicting the surface tension of drop images at a rate of 1.5 ms^-1 versus 7.7 s^-1, which is more than 5,000 times faster than the traditional method. The results are validated on real images …

Practice Elements Delivered By Teachers To Support Children Who Display Challenging Behaviors In Business-As-Usual Early Childhood Settings, Navneet Kaur

Theses and Dissertations

Approximately 15-25% of children ages 3 to 5 years in early childhood settings display chronic challenging behaviors that increase their risk for developing an emotional and behavioral disorder. The early onset of emotional and behavioral disorders has long-term negative implications for these children. Therefore, it is vital to address these problems early on. One approach is through teacher-delivered practices (i.e., specific strategies, such as praise) and programs (i.e., manualized interventions that contain a collection of practices) in the classroom. Some practices and programs have shown positive outcomes for children. However, when practices and programs do not outperform business-as-usual group (BAU), …

The Hepatic Immunological Pattern Shaped By Dominant-Subdominant Cellular Interactions Creates A Collective Function Beyond The Function Of Each Cellular Constituent To Orchestrate Progression Of Hepatocellular Carcinoma, Nicholas J. Koelsch

Theses and Dissertations

Abundance of data on the role of inflammatory immune responses in the progression or inhibition of hepatocellular carcinoma (HCC) has failed to offer a curative immunotherapy for HCC. This is largely because of taking reductionist approaches and missing the collective function of the hepatic immune system by focusing on specific immune cell types. To this end, we propose that focusing on the dominant-subdominant patterns of the immune cells would allow understanding of the mechanism by which a collective immune function emerges. To identify the collective immune function through a systems immunology perspective, we performed high-throughput analysis of snRNAseq data collected …

Trans* Streamers On Twitch.Tv: The Intersections Of Gender And Digital Labor, R. Lawson

Theses and Dissertations

Twitch.tv is a live entertainment platform where individuals live stream events, including playing video games, playing board and tabletop games, creating art, and more. Twitch has a diverse base of streamers, but Twitch has just begun. The most common approach has focused on cisgender, heterosexual white men in the cases where it has been studied. Though these streamers should be studied in sociology, this focus leaves out the experiences of both cis women and Trans* streamers. This research proposal tries to situate the relationship of Trans* streamers with both the platform and their audience, seeing if these relationships affect their …

I'M Not Sure It Was A Hoopoe Or A Decanter, Ali Kaeini

Theses and Dissertations

“I’m not sure it was a Hoopoe or a Decanter” explores the experience of cultural displacement through the lens of an Iranian artist and immigrant. Drawing on ancient Iranian stories, Persian poetry, and cultural artifacts, my paintings and drawings reflect the uncertainty of the contemporary political and religious conditions in Iran, as well as the challenges faced by individuals forced to flee their homeland due to war, political instability, and social conditions. My work weaves references to ancient Iranian objects, Persian miniatures' structural forms and patterns, and Islamic architecture, using traditional and contemporary materials to create large, unconventional paintings. Through …

Half Of Two Hungers, Aida A. Lizalde Rios

Theses and Dissertations

Abstract

half of two hungers is an extension of my sculptural practice; a weaving of the ambiguous borders of memory, trauma, disease, identity, assimilation, survival, spirituality, love, erotics, and desire. It is a psychological and sensorial landscape, where I travel consciously and subconsciously to pull shapes and material experiences out into the world of bodies and objects.

Food Deserts And Pediatric Oral Health Status In An Under-Resourced Urban Community, Jessica T. Mcauliffe

Theses and Dissertations

Purpose: The aim of this analysis of survey data was to assess the influence of living within a food desert as a predictor of oral health problems among children of East Henrico County, Virginia.

Methods: Survey participants were recruited and questionnaires applied online. Residing in a food desert, using access to affordable produce as a proxy value, was the independent variable, while self- reported assessment of the child’s oral health status was the primary outcome variable. Analyses controlled for other indirect factors of pediatric oral health. Logistic regression was used to model the association between the self-reported access to healthy …